"The return of the diplomatic presence of the EU in Libya will further strengthen co-operation with the government, local authorities and the United Nations," the bloc said in a statement on Saturday.

The EU relocated its Libya delegation to Tunis in 2014, as the country was mired into chaos after the 2011 uprising that toppled and killed Dictator Muammar Gaddafi.

Mogherini met the head of Libya's United Nations-backed Government of National Accord Prime Minister Fayez al-Sarraj and Foreign Minister Mohamed al-Taher Siala, alongside the UN's envoy to Libya Ghassan Salame, the EU said.

"Our presence here will be now much more regular. I had an excellent meeting with President al-Sarraj, we discussed the support the European Union is giving to Libya, to the Libyan people," Mogherini said.

"We are the first partner for Libya when it comes to humanitarian aid, when it comes to development cooperation but also we are the first economic partner for Libya and with the president we have discussed not only the political support the European Union is giving to the political process, also the preparation for elections, but also we have discussed new projects," she added.